Method and apparatus of fingerprint identification and terminal device

Abstract

The present application discloses a method of fingerprint identification, a fingerprint identification apparatus, a fingerprint identification chip and a terminal device. The method includes: detecting a value of a light signal reflected by a finger when a touch signal of the finger is received on a fingerprint identification area; determining whether the value of the light signal is within a preset numerical range; and determining a fingerprint contacting the fingerprint identification area is a live fingerprint if the value of the light signal is within the numerical range. Therefore, when a finger presses a fingerprint identification area, it is judged that a fingerprint contacting the fingerprint identification area is a live fingerprint or a non-live fingerprint through a value of a light signal reflected by the finger, thereby improving security of a fingerprint password.

What is claimed is: 
     
       1. A method of fingerprint identification, the method comprising:
 detecting a signal value of a reflected light signal generated by an object located above a fingerprint identification area, wherein the reflected light signal is generated by reflection of light on the object that is emitted by a display screen, and the fingerprint identification area is located in at least part of a display area of the display screen; 
 judging whether the signal value of the reflected light signal is within a preset numerical range; and 
 determining that the object above the fingerprint identification area is a live fingerprint if a signal value of the reflected light signal is within the numerical range; 
 wherein the reflected light signal is detected through an optical fingerprint sensor disposed below the display screen, and the optical fingerprint sensor comprises a sensing array with a plurality of optical sensing units, 
 wherein the light emitted by the display screen presents an annular pattern in the fingerprint identification area, the annular pattern corresponds to a light-emitting area of the fingerprint identification area, and an intermediate area surrounded by the annular pattern is a non-light-emitting area of the fingerprint identification area, and 
 wherein the detecting the signal value of the reflected light signal generated by the object located above the fingerprint identification area comprises:
 detecting, by optical sensing units located below the area, the signal value of the reflected light signal generated by the reflection of the light on the object that is emitted in the fingerprint identification area by the display screen and presents the annular pattern, wherein the reflected light signal passes through the display screen in the non-light-emitting area and is received by the optical sensing units. 
 
 
     
     
       2. The method according to  claim 1 , wherein the method further comprises:
 determining that the object above the fingerprint identification area is a non-live fingerprint if the signal value of the reflected light signal is outside the numerical range. 
 
     
     
       3. The method according to  claim 1 , wherein the preset pattern is further used to indicate a position of the fingerprint identification area in the display screen, for a user to determine the fingerprint identification area according to the preset pattern. 
     
     
       4. The method according to  claim 1 , wherein the method further comprises:
 capturing, according to the reflected light signal generated by the reflection of the light on the object located above the fingerprint identification area that is emitted by the display screen, a fingerprint image; and 
 matching the fingerprint image with a fingerprint image in a fingerprint database if it is determined that the object above the fingerprint identification area is a live fingerprint. 
 
     
     
       5. A fingerprint identification apparatus, wherein the fingerprint identification apparatus comprises an optical fingerprint sensor and a processor,
 wherein the optical fingerprint sensor is configured to detect a signal value of a reflected light signal generated by an object located above a fingerprint identification area, the reflected light signal is generated by reflection of light on the object that is emitted by a display screen, and the fingerprint identification area is located in at least part of a display area of the display screen; and 
 wherein the processor is configured to judge whether the signal value of the reflected light signal that is detected by the optical fingerprint sensor is within a preset numerical range, and determine that the object above the fingerprint identification area is a live fingerprint when the signal value of the reflected optical signal is within the preset numerical range; 
 wherein the optical fingerprint sensor is disposed below the display screen, and the optical fingerprint sensor comprises a sensing array with a plurality of optical sensing units; 
 wherein the light emitted by the display screen presents an annular pattern in the fingerprint identification area, the annular pattern corresponds to a light-emitting area of the fingerprint identification area, and an intermediate area surrounded by the annular pattern is a non-light-emitting area of the fingerprint identification area; and 
 wherein optical sensing units located below the non-light-emitting area in the optical fingerprint sensor is configured to detect the signal value of the reflected light signal generated by the reflection of the light on the object that is emitted in the fingerprint identification area by the display screen and presents the annular pattern, wherein the reflected light signal passes through the display screen in the non-light-emitting area and is received by the optical sensing units. 
 
     
     
       6. The fingerprint identification apparatus according to  claim 5 , wherein the processor is further configured to:
 determine that the object above the fingerprint identification area is a non-live fingerprint when the signal value of the reflected light signal is beyond the numerical range. 
 
     
     
       7. The fingerprint identification apparatus according to  claim 5 , wherein the preset pattern is further used to indicate a position of the fingerprint identification area in the display screen, for a user to determine the fingerprint identification area according to the preset pattern. 
     
     
       8. The fingerprint identification apparatus according to  claim 5 , wherein
 the optical fingerprint sensor is further configured to capture a fingerprint image according to the reflected light signal generated by the reflection of the light on the object located above the fingerprint identification area that is emitted by the display screen; and 
 the processor is further configured to match the fingerprint image with a fingerprint image in a fingerprint database when it is determined that the object above the fingerprint identification area is a live fingerprint. 
 
     
     
       9. A terminal device, comprising a display screen and a fingerprint identification apparatus, wherein the fingerprint identification apparatus is disposed below the display screen, and comprises an optical fingerprint sensor;
 the optical fingerprint sensor is configured to detect a signal value of a reflected light signal generated by an object located above a fingerprint identification area, wherein the reflected light signal is generated by reflection of light on the object that is emitted by a display screen, and the fingerprint identification area is located in at least part of a display area of the display screen; and 
 wherein the object above the fingerprint identification area is determined as a live finger when the signal value of the reflected optical signal is within a preset numerical range; 
 wherein the optical fingerprint sensor is disposed below the display screen, and the optical fingerprint sensor comprises a sensing array with a plurality of optical sensing units; 
 wherein the light emitted by the display screen presents an annular pattern in the fingerprint identification area, the annular pattern corresponds to a light-emitting area of the fingerprint identification area, and an intermediate area surrounded by the annular pattern is a non-light-emitting area of the fingerprint identification area; and 
 wherein optical sensing units located below the non-light-emitting area in the optical fingerprint sensor is configured to detect the signal value of the reflected light signal generated by the reflection of the light on the object that is emitted in the fingerprint identification area by the display screen and presents the annular pattern, wherein the reflected light signal passes through the display screen in the non-light-emitting area and is received by the optical sensing units.